Hess's law can be used to calculate reaction enthalpies for hypothetical processes that can't be carried out in the laboratory. Set up a Hess's law cycle that will let you calculate Δ H ° for the conversion of methane to ethylene: C H 4 ( g ) → C 2 H 4 ( g ) + 2 H 2 ( g ) You can use the following information: 2 C 2 H 6 ( g ) + 7 O 2 ( g ) → 4 C O 2 ( g ) + 6 H 2 O ( l ) Δ H ° = − 3120.8 kJ C H 4 ( g ) + 2 O 2 ( g ) → C O 2 ( g ) + 2 H 2 O ( l ) Δ H ° = − 890.3 kJ C 2 H 4 ( g ) + H 2 ( g ) → C 2 H 6 ( g ) Δ H ° = − 136.3 kJ H 2 O ( l ) Δ H ° f = − 285.8 kJ/mol
Hess's law can be used to calculate reaction enthalpies for hypothetical processes that can't be carried out in the laboratory. Set up a Hess's law cycle that will let you calculate Δ H ° for the conversion of methane to ethylene: C H 4 ( g ) → C 2 H 4 ( g ) + 2 H 2 ( g ) You can use the following information: 2 C 2 H 6 ( g ) + 7 O 2 ( g ) → 4 C O 2 ( g ) + 6 H 2 O ( l ) Δ H ° = − 3120.8 kJ C H 4 ( g ) + 2 O 2 ( g ) → C O 2 ( g ) + 2 H 2 O ( l ) Δ H ° = − 890.3 kJ C 2 H 4 ( g ) + H 2 ( g ) → C 2 H 6 ( g ) Δ H ° = − 136.3 kJ H 2 O ( l ) Δ H ° f = − 285.8 kJ/mol
Solution Summary: The author explains that the value of change in enthalpy for the conversion of methane to ethylene needs to be determined.
Hess's law can be used to calculate reaction enthalpies for hypothetical processes that can't be carried out in the laboratory. Set up a Hess's law cycle that will let you calculate
Δ
H
°
for the conversion of methane to ethylene:
C
H
4
(
g
)
→
C
2
H
4
(
g
)
+
2
H
2
(
g
)
You can use the following information:
2
C
2
H
6
(
g
)
+
7
O
2
(
g
)
→
4
C
O
2
(
g
)
+
6
H
2
O
(
l
)
Δ
H
°
=
−
3120.8
kJ
C
H
4
(
g
)
+
2
O
2
(
g
)
→
C
O
2
(
g
)
+
2
H
2
O
(
l
)
Δ
H
°
=
−
890.3
kJ
C
2
H
4
(
g
)
+
H
2
(
g
)
→
C
2
H
6
(
g
)
Δ
H
°
=
−
136.3
kJ
H
2
O
(
l
)
Δ
H
°
f
=
−
285.8
kJ/mol
sketch the nature of the metal-alkylidene bonding interactions.
Part C
The perspective formula of isoleucine, an amino acid, is provided below.
HOOC
H₂NIC
H
川
CH3
CH,CH3
Draw the Newman projection in staggered conformation for isoleucine by viewing the molecule along the
C-2-C-3 bond.
1. Edit the Newman projection on the canvas.
2. Replace the appropriate hydrogens with the appropriate -CH3 or other groups.
3. If you need to start over, Undo or choose a Newman projection from the Templates toolbar
(bottom).
Important: Never delete the hydrogen atoms or bonds directly attached to the template, and do not move
them by dragging or dropping them. That will break the projections structures. Only replace them!
▸ View Available Hint(s)
0 2
H± 3D
EXP.
L
ד
י
CONT. 2
H
0
N
о
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